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参数资料
| 型号： | DS2450S |
| 英文描述： | 1-Wire Quad A/D Converter |
| 中文描述： | 1线四通道A / D转换器 |
| 文件页数： | 18/24页 |
| 文件大小： | 523K |
| 代理商： | DS2450S |
DS2450
18 of 24
102199
USAGE EXAMPLE
(control channel A and channel B outputs)
MASTER MODE
TX
RX
TX
TX
TX
TX
TX
DATA (LSB FIRST)
Reset
Presence
CCh
55h
08h
00h
80h if AFL = 1 / C0h if
AFL = 0
<CRC16>
<data byte>
00h
<CRC16>
00h
80h if AFH = 1 / C0h if
AFH = 0
<CRC16>
<data byte>
Reset
Presence
COMMENTS
Reset Pulse (480 - 960
μ
s)
Presence Pulse
Issue “Skip ROM” Command
Issue “Write Memory” Command
TA1, beginning address
TA2, address = 0008h
data byte (address 0008)
CH-A
RX
RX
TX
RX
RX
TX
CRC of command, address, data byte
read-back for simple verification
next data byte (address 0009h)*
CRC of address, data byte
read-back for simple verification
data byte (address 000A)
CH-B
RX
RX
TX
RX
CRC of address, data byte
read-back for simple verification
Reset Pulse (480 - 960
μ
s)
Presence Pulse
*In a multi-drop environment it takes less time to perform a non-changing write cycle rather than
skipping a byte.
1-WIRE SIGNALING
The DS2450 requires strict protocols to ensure data integrity. The protocol consists of four types of
signaling on one line: reset sequence with reset pulse and presence pulse, Write 0, Write 1 and Read Data.
All these signals except presence pulse are initiated by the bus master. The DS2450 can communicate at
two different speeds, regular speed and Overdrive Speed. If not explicitly set into the Overdrive mode,
the DS2450 will communicate at regular speed. While in Overdrive mode the fast timing applies to all
wave forms.
The initialization sequence required to begin any communication with the DS2450 is shown in Figure 10.
A Reset Pulse followed by a Presence Pulse indicates the DS2450 is ready to send or receive data given
the correct ROM command and memory function command. The bus master transmits (TX) a reset pulse
(t
RSTL
, minimum 480
μ
s at regular speed, 48
μ
s at Overdrive Speed). The bus master then releases the
line and goes into receive mode (RX). The 1-Wire bus is pulled to a high state via the pullup resistor.
After detecting the rising edge on the data pin, the DS2450 waits (t
PDH
,15-60
μ
s at regular speed, 2-6
μ
s
at Overdrive speed) and then transmits the Presence Pulse (t
PDL
, 60-240
μ
s at regular speed, 8-24
μ
s at
Overdrive Speed).
A Reset Pulse of 480
μ
s or longer will exit the Overdrive Mode returning the device to regular speed. If
the DS2450 is in Overdrive Mode and the Reset Pulse is no longer than 80
μ
s the device will remain in
Overdrive Mode.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2450S/T&R | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| DS2450S+ | 功能描述:模数转换器 - ADC Quad 1-Wire RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| DS2450S+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| DS2450S+T&R | 制造商:Maxim Integrated Products 功能描述:IC CONVERTER A/D QUAD 1-W 8-SOIC |
| DS2450S+T&R | 功能描述:模数转换器 - ADC Quad 1-Wire RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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